Gas-exhauster governor



Dec. 26, 1922.

- 1,440,297. 0. R. HOUGHTON.

(1A8 EXHAUSTEH GOVERNOR.

mm $EPT.9. 1921.

= Ill/11111114 Gas Suction Main 3mm M wz Patented Dec. 26 1922.

UNHTED STATE-S time? PATENT @FFliChL CARL B. HOUGH'I'ON. 0F CONNEBSVILLE, INDIANA, ASSIGNQB TO THE GONNERSVILLE BLOWER (10., 0F CONNERSVILLE, INDIANA, A CORPORATION OF' DTDIANI).

GfiEXHAU'STEB GOVERNOR.

Application filed September 9, 1821. Serial No. 498,491.

To ill whom may cont-mm Tie it known. that I, Com. It. HUL'GII'I'IIX, a citizen of the United States, residing at (onncrsrille,- in the county of Fayette and State of Indiana, have invented a new and useful Gas-Exhaustcr Governor, of which the followin is a 3)e(lfit'flti0n.

In the operation 0 gas plants orhy-product coke plants. it is desirable to maintain n constant suction in the go. suction main whit-h leads. to the exhauster. The quantity of gas which pastqes through'the exhnostcr is nearly constant over long periods. The variation in the speed of the cxhuuotm' in a days run is ordinarily less than llif/rv from nunimum to maximum. The variation of speed within an hour is ordinarily oss thou The variation in a five-minute pol-ind is ordinarily le s than 1% to corrcct for tho. variation in the quantity of gas.

Since the cxhnuoter most rnn'at in nearly constant speed, and yet must be able to rhnnge its speed promptly to correspond with changes in the qunntity of gas so plicd. the one tion of regulation is extremely important; for any material voriution in the prcs urr in the gas suction main is not' permi'ssoblc. While it would sworn thnt, the problem of obtaining this mgzulution is very simple, especially in view of the relativcly constant rate. at which gas is supplied to tho cxhnnster. yet as a matter of fact it is found very diflicult so to regulate the speed of the cxhauster that tho prmoure within the ms suction main in mnintained within the proper limits. Tf a pressure governor alono is used to balance the gas-exhauster speed against the suction in the gap suction main, a slight variation in the steam pressure canoes the exhauster to change its speed, and this in turn changes the. suction in the gas suction main. which change again in turn is transmitted to the governor iind hack to the enginc: with the rcsult that ordinarily there is a continual swinging, surging, or hunting action. with'tho pressure and the speed nltcrmitely rising materially above and falling materially bclow the dcfiirerl prcssurr. and szperd instead of remaining substantially constant.

it is the object of my invention to correct for variation in the stomp promote and other disturbing factors bcfore the change in the cxhouster speed can direct the pressure in the gas suction main, and thus to avoid the surging or hunting efi'ect referred to above.

In obtaining this result, I use a small vention. some of the parts of. the governor being: shown in section; and Fig. 2 is a. central vertical section through the pilot valve which is operated by the prersum governor.

The exhanster 10 is drivenby the usual engine 11, or other driving means and draws gas from the usual gas suction nmin 12 and discharges it into the usual discharge main [3. which two mnins are connected to the collecting mains of the oven batteries and to the usual gas-bundling moons of a gas plant in the well understood way.

The steam for the engine 11 is supplied thronghn pipe 14. and the supply of steam is c-ontrollcd by n lever 15. which may he any suitable control lever for any desired kind of engine control. The lcrrr l5 is operable b an arm to provided with a counterweight 17; and the arm 16 is connected to the piston rod 18 of a piston 19 movable vertically in a cylinder 20 so that when the piston 19 rises thc arm 16 works the lever 15 to reduce the cnn'ine speed and vice verso. The cylinder 20 together with its piston 19 and the connection 18 and lever 16 constitute a presmre responsive device connected to the oontrol. member of the ennice for controlling the steam supply there to. For the sake of safety, T a it bell governor 21, responsive to the engine speed. but this hall governor is arranged to come into play only when thespced of the em haustcr rises unduly high, so that it plays no part in the regular controlling action a is mcrcl tl. safety device.

he lower part of the cylinder 20 is conneoted to an air-supply pipe 25 and to on air-outlet pipe 26, both of which communicute with the cylinder 20 below the lowest point which the piston 19 can reach. The

so provide air-supply pi e 25 is connected to the outlet 10 so that the speed of the blower and of the exhauster vary in proportion; as shown, the driving of the blower 27 is by an ordinary belt 28, but this is merely one illustration;

Thus as the speed of the exhauster 10 in creases, the speed of and consequently the quantitypf air discharged by .the blower 27 is proportionately increased. The air'outlet pipe 26 lends from the cylinder 20 to a ilot valve 29, which is shown in detail in i 2. This ilot valve is a continuouslea age valve, 1: 1e amount of the leakage do pending upon the position of the valve stem 30. This valve stem 30 projects through the end walls of a chamber 31 into which the pipe 26 leads and the stem is provided at each end walls with cutaway portions 32 which allow the escape of air from the chamber 31 at a rate dependent upon the position of the stem 30. The cut-away portions 32 are so arranged that a balance of the leakage air through the two end walls is obtained, and the stem thereby maintained in a balanced condition.

The stem 30 of the pilot valve is conncctet shaped ends to get constant lengths of effective lever arms. The flout 37 of the gasometer hangs from one end of the lever 36. and a counterweight from the other. The float 37 is vertically movable. as a gasome ter float, in an open-topped water container 39 of the gasometor, and a pipe 40 which communicates. with the gas suction main )2 opens beneath the final; 37. so that the pressure beneath such float is that existing-within the gas suction main. It is thus secu that the container :19 together with its floatti? constitute a pressure mnponsivc dcvicc rc sponsive to the pressure in the gas muiu for controlling the operation of the leakage or pilot mm 29.

In o wrution. the cxlmustcr l0 draws gas from the gas suction main 12 andilisehurges it into the discharge main [3. The blower 27 blows air through the pipe'25 into the cylinder '20 hcnenth the piston lllfand more or less of the air thus supplied to the oylindcr 20 escapes therefrom through the pipe 26 and pilot valve 29. the amount escaping depending upon the position of the stem 30 of thc. -pilot valve. The air pressure beneath the piston l9 raises such piston to a greater or less height, and thus: moves the control lever 15 more or less. The blnwc! 27 keeps a constant pressure on the bottom of the piston 19 for a. constant speed of the cxhauster. If for an reason the speed of the exheuster increases, as because of it change in steam pressure or because of u. change due to c movement of the limit 151' 12'. T to float 37 is pr'efem essee? the piston to its'oriigiual value does not occur until thespeed of the blower 27. nnd there fore of the cxhauster, is' the serum as it was before. This gives an instantaucous control arid eilectually rcvents the objectionable sum-gin and hun ing. A

If the quantity of gas supplied through the gas suction main 12 changes. the pressure in such main correspondingly chan and the gasoineterv float 3T rises or fa ls. This movement of the float 87 moves the stem 30 of thepilot valve 29 to allow more or less air to escape, at the pilot valve, and such chan e. in the air leakage produces a downwnn or upward movement of the piston. 19 to d )crutc'th'e control lever 15 to increase or eecreasc tho-steam supply and thus to make the esliaustcr 10 and blower 2? run at a greater or less speed to correct for this difference in air leakage and thus'to take care of the 'ohange in the quantity of gas su plied throilgh the b y provided with a nearly closed lmtt'om ll so that the water .can pass into or outof the float only at 9.

slow rate. Tll'lSlllllkBS the movement of the flout 3T relatively slilggish and dead-beat, and this assist 'in preventing any hunting or mrgingactiom-In case the governing notion .nbuve dcmribcd fails for any reason, and

the s wad of the cn'gineand exhauster rises umlulyrtheball governor 2i comcs into play nmlprevents the engine from running eway.

I claim as my invention l. Inmmhinution. an exhauster drawing gas from the gas suction main and discharging it into the discharge main of a as lent, an engine for operating said exnugget. n control member controlling the supply of stenm' to said on inc, a ressure responsive device conneo to sai control member-to operateit; and a blower arr-an to 0 rate at a spetlpro' rtional to at of e ex'lniuster and supp ying air to and pressu-ro-mponsive-device.

2. In combination. an exhauster drawing suction miiin' gas from thegas suction main and dis'charg arrnn ed to that of the exhauster and supplying air to said pressure-rcsponsive device, and a leakage valve connected to said pressure-responsive device, and a second pressure-responsive device responsive to the pressure in said gas suction main and controlling said leakage valve.

3. In combination, an exhanster drawing gas from the gas suction main and discharging it into the discharge main 'of a gas plant. driving means for said exhauster, a control member controlling the supply of energy to said driving means, a pressureresponsive device connected to said control member to operate it, and a blower arranged to operate at a speed pro ortional to that of the exhauster and supp ying air to said pressure-responsive device.

4. In combination. an exhauster drawing gas from the gas suction main and discharging it into the dischage main of a gas plant, drivin means for said exhauster, a control mem er controlling the supply of energy to said driving means. a'pressureresponsive device connected to said control member to operate it, a blower arranged to operate at a speed proportional to that of the exhauster and supplying air to said pressure-responsive device, and a leakage valve connected to said pressure-responsive device, and a second pressure-responsive de vice which is responsive to the pressure in said gas suction main and controlling said leakage valve.

5. In combination, an exhauster drawing gas from the gas suction main and discharging it into the discharge main of a gas plant. an engine for operating said exhauster, a control member controllin the supply of steam to said engine, a cylinder and piston, said piston being connected to said control member to operate it, and a blower driven at a speed proportional to the speed of the exhauster and supplying air to said cylinder.

6. In combination, an exhauster drawing gas from the gas suction main and discharging it into the discharge main of a gas plant, driving means for said exhauster a control member controlling the sup ly 0 energy to said driving means, a cy inder and piston. said piston being connected to said control member to operate it. and a blower driven at a speed proportional to the speed of the exhauster and supplying air to said cylinder.

7. In combination, an exhauster drawing gas from the gas suction main and discharging it into the discharge main of a. gas plant, an engine for operating said exhauster, a control member controlling the supply of steam to said engine, a cylinder and piston, said piston being connected to said control member to operate it, a blower driven at a speed proportional to the speed of the exhauster and supplying air to said cylinder, an outlet pipe from said cylinder, :1 continuous-leakage pilot valve connected to said outlet pipe and thus controlling leakage from said cylinder, and a gasometer having a float whic is subject to the pres sure within said gas suction main, said float being operably connected to said pilot valve.

8. In combination, an exhauste'r drawing gas from the gas suction main and discharging it into the discharge main of a gas plant, driving means for said exhauster, a control member controlling the sup 1y of energy to said driving means, a cylinder and piston, said piston being connected to said control member to operate it, a blower driven at a speed proportional to the speed of the exhauster and supplying air to said cylinder, an outlet pipe from said cylinder, :1 continuousleakage pilot valve connected to said outlet pipe and thus controlling leakage from said cylinder and a gasometer having a float which is subject to the pressure within said gas suction main, said float being operably connected to said pilot valve.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 1st day of September, A. D. one thousand nine,

hundred and twenty one.

CARL R. HOUGHTON. 

